The dyes in the filaments we see in the blood have photooptical, biosensing function, as well as control of self assembly. Other functions include payload delivery, be that gene delivery or optogenetic manipulation of cells. Business partners of C19 bioweapon manufacturers are producing polymer dyes in the respective colors seen in human blood.
https://anamihalceamdphd.substack.com/p/darkfield-live-blood-analysis-of-646